post-merge: --ps-protocol fixes

Includes:

MDEV-17302 Add support for ALTER USER command in prepared statement

and

MDEV-17673 main.cte_recursive fails in bb-10.4-ps branch in --ps

  Set correct SELECT_LEX linkage for recursive CTEs.
  Do not delegate this job to TABLE_LIST::set_as_with_table,
  because it is only run on prepare, while With_element::move_anchors_ahead
  is run both on prepare and execute (fix by Igor)

mysql-test/extra/rpl_tests/create_recursive_construct.inc

@@ -296,7 +296,9 @@ if ($CRC_RET_stmt_sidef) {
   --echo
   --echo Invoking $CRC_RET_desc.
   if ($CRC_create) {
+    --disable_ps_protocol
     --eval $CRC_create
+    --enable_ps_protocol
   }
 
   --echo * binlog_format = STATEMENT: expect $CRC_ARG_expected_number_of_warnings warnings.

mysql-test/r/show_explain_ps.result

@@ -31,12 +31,11 @@ count(*)
 set debug_dbug='';
 select event_name
 from
-performance_schema.events_stages_history_long
+performance_schema.events_stages_history_long join
+performance_schema.threads using (thread_id)
 where
 event_name like '%show explain' and
-thread_id in(select thread_id
-from performance_schema.events_statements_history_long
-where EVENT_NAME='statement/sql/show_explain');
+processlist_id=$thr1;
 event_name
 stage/sql/show explain
 drop table t0;

mysql-test/suite/innodb/t/innodb-index.test

@@ -1166,7 +1166,9 @@ DROP TABLE t;
 CREATE TABLE t (a INT) ENGINE=INNODB;
 -- remove_file $MYSQL_DATA_DIR/test/t.frm
 -- move_file $MYSQL_DATA_DIR/test/t.fr_ $MYSQL_DATA_DIR/test/t.frm
+--enable_prepare_warnings
 SHOW CREATE TABLE t;
+--disable_prepare_warnings
 DROP TABLE t;
 
 --disable_query_log

mysql-test/t/show_explain_ps.test

@@ -49,12 +49,12 @@ reap;
 
 set debug_dbug='';
 
-select event_name
-from
-performance_schema.events_stages_history_long
-where
-  event_name like '%show explain' and
-  thread_id in(select thread_id
-               from performance_schema.events_statements_history_long
-               where EVENT_NAME='statement/sql/show_explain');
+evalp select event_name
+        from
+        performance_schema.events_stages_history_long join
+        performance_schema.threads using (thread_id)
+        where
+          event_name like '%show explain' and
+          processlist_id=$thr1;
+
 drop table t0;

sql/sql_cte.cc

@@ -689,6 +689,7 @@ void With_element::move_anchors_ahead()
     }
   }
   first_recursive= new_pos;
+  spec->first_select()->linkage= DERIVED_TABLE_TYPE;
 }
 
 

sql/sql_parse.cc

@@ -2479,8 +2479,11 @@ void log_slow_statement(THD *thd)
   if (!thd->enable_slow_log)
     goto end; // E.g. SP statement
 
-  DBUG_EXECUTE_IF("simulate_slow_query",
-                  thd->server_status|= SERVER_QUERY_WAS_SLOW;);
+  DBUG_EXECUTE_IF("simulate_slow_query", {
+                  if (thd->get_command() == COM_QUERY ||
+                      thd->get_command() == COM_STMT_EXECUTE)
+                    thd->server_status|= SERVER_QUERY_WAS_SLOW;
+                  });
 
   if (((thd->server_status & SERVER_QUERY_WAS_SLOW) ||
        ((thd->server_status &

sql/sql_prepare.cc

@@ -2530,6 +2530,7 @@ static bool check_prepared_statement(Prepared_statement *stmt)
   case SQLCOM_ALTER_DB_UPGRADE:
   case SQLCOM_CHECKSUM:
   case SQLCOM_CREATE_USER:
+  case SQLCOM_ALTER_USER:
   case SQLCOM_RENAME_USER:
   case SQLCOM_DROP_USER:
   case SQLCOM_CREATE_ROLE: